Setup, Cold email, Infrastructure
Do You Need a Separate Domain for Cold Email?
Nothing forces you to, but reputation attaches to the sending domain. A separate one keeps a cold email problem away from the domain your customers and team use.
5 min read
In this article
Yes, in practice. Nothing forces you to use one, but reputation attaches to the sending domain, so cold email from your main domain puts the mail your customers and team depend on at risk. If a campaign draws complaints or bounces, the damage lands on the domain every other mailbox shares. A separate domain keeps that risk away from it.
Why a separate domain
- Contain the risk. A spam complaint or bounce problem on the cold domain stays there. Your main domain keeps its history.
- Protect everyday mail. Invoices, support replies and staff email use the main domain. You do not want them filtered because of a campaign.
- Freedom to replace. A cold domain that gets damaged can be retired. Your main domain cannot.
How to set one up
- Pick a domain close to your brand, so a recipient who checks recognises it. Do not imitate another company.
- Add SPF, DKIM and DMARC before any mail is sent, and check them with a free tool.
- Create two to three mailboxes on it. Our sending limits page gives the guideline, and the mailboxes and domains post has the sum.
- Warm it up before real campaigns. Our warmup guide gives new domains roughly three to four weeks, and the campaign ramp starts at a few emails a day per mailbox.
- Keep the main domain's website and an About page live on the new one, so it looks like a real business.
When you might not need one
A person emailing a handful of warm, relevant contacts one by one, from their normal address, is not running cold outreach at scale and does not need a new domain. The advice above is for anyone sending to lists, in volume, with a tool. If you are unsure which you are, use a separate domain: it costs a domain and a few mailboxes, and a damaged main domain costs far more.
Frequently asked questions
Can I use a subdomain of my main domain for cold email?
We have not tested how mailbox providers treat a subdomain against its parent, so we do not make a claim either way. A fully separate domain is the clearer separation.
How many mailboxes should go on a separate cold email domain?
Two to three is the guideline on our sending limits page. It keeps the domain's total daily volume modest.
Does a separate domain still need warmup?
Yes. A new domain has no history, so it needs warming before real campaigns, and the damage from skipping that attaches to the domain.
